Summit 670

[Newfee]

Im planin to do some upgrades to my 96 670 and just wondering what would be the best bang for buck mods to do first were. so far is got pipes on it and someone took off the hac system not sure if it was a good idea or not but any info helps i will be mostly riding around spruce grove /parkland county area.

 

[KORE]

Im waiting for a Vari-flo system for my 96" and Im looking to stretch my track. Engine is stock with KN filters, the 670 a pretty solid unit already im thinkin some new reeds and some porting might be simple and effective,....anyone?

 

[99summitx]

Im waiting for a Vari-flo system for my 96" and Im looking to stretch my track. Engine is stock with KN filters, the 670 a pretty solid unit already im thinkin some new reeds and some porting might be simple and effective,....anyone?

I may be wrong but I don't think the 670's use reeds, at least my x dont!!

 

[SLEDBUNNYRACING]

The 670's were a rotary valve, no reeds is correct.

I may be wrong but I don't think the 670's use reeds, at least my x dont!!

 

[KORE]

My bad, how can the rotary valve be tweaked for better throttle response?

 

[4extreme]

I had a `95 summit which I put UFO`s in and re-jetted. I got better throttle response and what felt to be more power. I also had K&N filters, Pipe and Can. And I upgraded the rear suspension, I think you already have it with the `96.

 

[KORE]

Im sorry a ufo... im new!!

 

[Junior Highmark]

check out our 670 '99.. its modded pretty good

 

[Summiteer]

Im sorry a ufo... im new!!

They're inserts that smooth the flow of air through the carbs.

 

[KORE]

OH! whats something like that worth and are they really effective?

 

[Summiteer]

Depends on who you talk to. some guys say that they improve throttle response in the low and mid-range, some guys say don't bother unless you do other stuff (head work, polish & port etc.)

 

[4extreme]

OH! whats something like that worth and are they really effective?

I think it was worth it on my `95. I had a can and K&N`s, so my thinking was more air in...more air out. I think they cost about $100 for the set. If you look at the carb`s sliders on the rounds, you could see where it can create alot of turbulance, and like what was already said it helps with air flow.

 

[boondockin]

Im planin to do some upgrades to my 96 670 and just wondering what would be the best bang for buck mods to do first were. so far is got pipes on it and someone took off the hac system not sure if it was a good idea or not but any info helps i will be mostly riding around spruce grove /parkland county area.

Depending on what kinda price range you are looking at get the 740 big bore kit, i've found them for around 500$, i was going to put the big bote on my 670 but i bought an 800 instead, talk to deano670, he seems like he knows whats going on in the 670 world

 

[dmj1]

Im sorry a ufo... im new!!

they are inserts that go inside you round slide of the carb.
they create less turbulence and increase air flow.
worked great on my old Indy 500 . better power ,better throttle response ,better mileage .not sure how they work with rotary intake?

 

[KORE]

thanks man!

 

[Summitric]

Ufo's are very tricky to set up... Time consuming, but once done they work okay... I put stock carbs on last year to detune a little for the kid to drive.

 

[TABSTER]

Talk to Ken @ Mountain Magic in Edmonton about stuff for your 670. He is a very knowledgable guy, and has lots of experiance with the 670's.

 

[Modman]

My bad, how can the rotary valve be tweaked for better throttle response?

Get a #501 rotary valve or send yours to The Crankshop for cutting to the 501 specs (Deano - do you cut these?). Night and day difference.

UFO's not worth the price for the HP increase in my opinion.

 

[Deano670]

Can cut or order. There are many more effective mods in my mind to be made to the 670. Pipes for one,shorty intake and boots,throw the oil inj in the bushes. A very sweet port and polish top and bottom Slick the hair back in the carbs and you have got yourself a VERY competitive twin for a relatively small expense. Will it keep up with todays tech YES OHHH YES

 

[Rucky]

Can cut or order. There are many more effective mods in my mind to be made to the 670. Pipes for one,shorty intake and boots,throw the oil inj in the bushes. A very sweet port and polish top and bottom Slick the hair back in the carbs and you have got yourself a VERY competitive twin for a relatively small expense. Will it keep up with todays tech YES OHHH YES

Deano, what's the reason for throwing out the oil injection?? Seems like such a pain in the azz to premix all the time.